Mitsubishi Electric CITY MULTI PUHY-P200YEM-A Service Handbook page 139

Checking
code
6607 No ACK error
(continued)
System
Generating Display of
compo-
unit address trouble
sition
1 Outdoor
Remote
unit (OC) control-
ler (RC)
2 BC
Remote
controller control-
(BC) ler (RC)
3 Indoor
Remote
unit (IC) control-
ler (RC)
4 Remote
Remote
controller control-
(RC) ler (RC)
Meaning, detecting method
When no ACK signal is detected in 6 continuous times with 30 second
interval by transmission side controller, the transmission side detects error.
Note: The address/attribute shown on remote controller indicates the
controller not providing the answer (ACK).
Detecting
method
No reply As same that for single refrigerant system.
(ACK) at
BC
transmis-
sion to OC
No replay As same that for single refrigerant system.
(ACK) at IC
transmis-
sion to BC
No reply 1) Cause of 1) ~ 5) of "Cause for single refriger-
(ACK) at ant system".
RC 2) Disconnection or short circuit of transmission
transmis- line of OC terminal block for centralized
sion to IC control(TB7).
3) Shut down of OC unit power source of one
re-frigerant system.
4) Neglecting insertion of OC unit power supply
connector (CN40).
5) Inserting more than 2 sets of power supply
connector (CN40) for centralized control use.
For generation after normal operation conduct-
ed once, the following causes can be consider-
ed.
• Total capacity error
• Capacity code setting error
• Connecting set number error
• Address setting error
No reply 1) Cause of 1) ~ 3) of "Cause for single refri-
(ACK) at IC gerant system".
transmis- 2) Disconnection or short circuit of transmission
sion to RC line of OC terminal block for centralized
control(TB7).
3) Shut down of OC unit power source of one
refrigerant system.
4) Neglecting insertion of OC unit power supply
connector (CN40).
5) Inserting more than 2 sets of power supply
connector(CN40) for centralized control use.
At generation after normal operation conducted
once, the following causes can be considered.
• Total capacity error
• Capacity code setting error
• Connecting set number error
• Address setting error
Cause
(7100)
(7101)
(7102)
(7105)
(7100)
(7101)
(7102)
(7105)
- 138 -
Checking method & countermeasure
Same as measure for single refrigerant
system.
Same as measure for single refrigerant
system.
a) Shut down the power source of both
IC and OC for over 5 minutes simul-
taneously, and make them again.
Normal state will be returned incase
of accidental trouble.
b) Check for 1) ~ 5) of causes. If cause
is found, remedy it.
c) Check other remote controller or OC
unit LED for troubleshooting for
trouble.
Trouble Modify the trouble ac-
cording to the content
of check code.
No trouble Faulty indoor con-
troller
a) Shut down the power source of OC
for over 5 minute, and make it again.
Normal state will be returned in case
of accidental trouble.
b) Check for 1) ~ 5) of causes. If cause
is found, remedy it.
When normal state can not be ob-
tained, check 1) ~ 5) of causes.